This page contains various examples of triggers you can use for your builds.
Name: Mouthplay
Position in the middle of mouth build and set radius so that entire mouth is covered, while trying to avoid covering too much of the throat.
Delay determines how often prey are tossed around in the mouth. Set to somewhere in range of 1 second - 3 seconds depending on desired intensity.
Push Effect
Direction mode.
Name: GurgleLoop
Delay: 120s
Chance: 69%
Sound Effect
Sound: custom:gurgles_ambient
Volume: 0.7 (optional, lets other sounds be heard more)
Name: Heartbeat
Delay: 2.5s
Delay: 0s
Sound: minecraft:entity.warden.heartbeat
Volume: 1.2
Pitch: 0.9
Delay: 2s
Sound: minecraft:entity.warden.heartbeat
Volume: 2.0
Pitch: 1.0
Name: BubblyNoises
Delay: 3s
Sound Effect
Sound: minecraft:block.bubble_column.whirlpool_ambient
Volume: 2
Pitch: 0.5
Sound Effect
Sound: minecraft:block.bubble_column.upwards_ambient
Volume: 1
Pitch: 0.5